On 11 december 2017, Vladimir Putin announced that Russian army would partially withdraw from Syria.
"In two years, the Russian armed forces, together with the Syrian army, have defeated the most lethal group of international terrorists," Tass quoted Putin as saying. "In this regard, I have decided that a significant part of the Russian military contingent in the Syrian Arab Republic is returning home to Russia."
Russian military contingent is (officially) operating in Syria since the autumn of 2015. But it is not the first time Putin declares he want to pull the troops out. He already did so in march 2016 but it seems this communication was never followed by a real withdrawal.
Has there been an actual pull out of Russian Army since 11 december 2017 ?
Is there any difference in the numbers or in the nature of Russian troops in Syria in may 2018 compared to december 2017 ?
As there been further communication of Russian officials about the calendar of the withdrawal, about the quantity of troops that are planned to leave or remain in Syria, or about any rescheduling ?
N.B. : This question is just about the factual existence or non-existence of the withdrawal. For any discussion about Putin's motivations for announcing a pull out, please refer to this other question.